JPH02246052A - Method for recording and reproducing of draw type optical disk - Google Patents

Abstract

PURPOSE:To improve the use efficiency of an optical disk by normally completing an action apparently without directly deciding that abnormality occurs even when the erroneous detection of a flag occurs during the execution of the information recording action. CONSTITUTION:Even when the flag 12 is detected while information is being recorded, it is decided as the erroneous detection of the flag 12 in the case that user data 13 does not exist in a sector 10, and the 1st user data 13 is recorded in the sector 10 in an auxiliary area to normally complete the action apparently. Even when the sector 10 where the user data 13 does not exist is detected while the information is being reproduced, the user data 13 is reproduced to normally complete the action apparently in the case that the 2nd user data 13 exists in the auxiliary area. Thus, the burden of a host computer is reduced and the use efficiency of the optical disk is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording/playback method for a write-once optical disc used as an external storage device for a host computer, and particularly relates to a method for recording and reproducing a write-once optical disc used as an external storage device for a host computer. The present invention relates to a recording and reproducing method for a write-once optical disc that prevents termination.

[Prior Art] Write-once optical disk devices that sequentially record digital data into vacant sectors among a plurality of sectors defined on a recording medium are well known. In this type of apparatus, for example, when a command is received from a host computer that knows empty sectors, user data is recorded and reproduced for each sector.

Figure 3 shows, for example, the "New Media Technology Series Optical Disc" published by Ohmsha on May 10, 1985 (IEICE publication, page 103, Figure 4.12).
FIG. 2 is an explanatory diagram showing a sector format of a general write-once optical disc.

In the figure, (10) is a sector defined on an optical disk (described later), and a preformat (11) for storing address information of sector (10) and a sector (
10), and recorded user data (13).

A plurality of sectors (10) having the same configuration as in FIG. 3 are defined in the normal area and the spare area of the optical disc, and individual preformats (11) are set in advance for each sector.

FIG. 4 is a block diagram showing a general write-once optical disc device, in which (1) is an optical disc that includes a plurality of sectors (10), and (2) is a block diagram that reads information from each sector (10) of the optical disc (1). data reproduction means; (3) flag detection means for detecting a flag (12) from reproduction information; (4) user data detection means for detecting user data (13) from reproduction information; (5) optical disc (1); (6) is an internal control means for controlling the entire apparatus; (7) is a host interface control means for exchanging commands with a host computer (not shown).

5 and 6 are flowcharts showing a conventional write-once optical disc recording and reproducing method, and FIG. 5 shows information by the flag detection means (3), data recording means (5), and internal control means (6). The recording operation is shown, and FIG. 6 shows the information reproducing operation by the data reproducing means (2), the user data detecting means (4) and the internal control means (6).

Next, a conventional recording/reproducing method for a write-once optical disc will be described with reference to FIGS. 3 to 6.

As shown in FIG. 5, when receiving a command from the host computer and recording the first user data in a sector of the optical disk (1), first, the first user data is recorded in the sector (10) specified by the address information of the preformat (11). flag (1
2) and determines whether the flag (12) is present (step S1).

At this time, if flag (12) is detected, the sector (
10), the information recording operation is interrupted, and an abnormal termination report is sent to the host computer (step S3).

Also, if there is no flag (12), the specified sector (1
0) as user data (13), and a flag (12) in the sector (10).
) (step S4).Finally, it is determined whether the recorded sector (10) is the final sector among the designated sectors (step S5).If it is not the final sector, the process returns to step S1 and If so, a normal termination report is sent to the host computer (step S6).

On the other hand, as shown in FIG. 6, when reproducing the second user data from the sector specified by the host computer,
First, the user data (13) of the sector (10) is to be reproduced (step 511), and it is determined whether there is an unrecorded sector (step 512).

At this time, the specified sector (10) is the user data (1
3), the information reproducing operation is interrupted and an abnormal termination report is sent to the host computer (step 513).

Also, if it is not an unrecorded sector, the user data (13) reproduced in step Sit is used as second user data,
It is sent to the host computer via the internal control means (6) and the host interface control means (7). Finally, it is determined whether the reproduced sector (10) is the final sector among the specified sectors (step 515), and if it is not the final sector, the process returns to step Sll, and if it is the final sector, it is normal for the host computer. Submit a completion report (
Step 516).

This way, when recording information, you can prevent double recording and
User data (13) are sequentially recorded in empty sectors (10) without flags (12), and when information is reproduced, user data (13) recorded in a predetermined sector (10) is reproduced. At this time, if there is a flag (12) in the sector (10) specified by the host computer when recording information,
User data (
13), abnormal termination is reported (step S3.513) and subsequent processing is left to the host computer.

However, for example, dirt may adhere to the part of the optical disc (1) that corresponds to the flag (12), and defects may occur during manufacturing, so the flag (12) may be incorrectly displayed when recording information. Detection may also occur. Therefore, the data recording means (5) and the internal control means (6) treat the user data (13) as being in a double recording state, and there is a risk that an inappropriate abnormal termination report (step S3) will be made to the host computer. In particular, when flag (12) is erroneously detected while recording information across many sectors,
If the recording operation is restarted from another sector, the information recorded up to that point may be wasted, and the efficiency of use of the optical disc (1) will deteriorate.

In this way, if the abnormal termination reporting step S3 is executed due to the erroneous detection of flag (12) during information recording, the processing of the host computer may become confused or the host computer may execute extra processing. Depending on the processing, the usage efficiency of the optical disc (1) may become even worse.

[Problems to be Solved by the Invention] As described above, in the conventional write-once optical disk recording and reproducing method, when it is determined that the flag (12) is present in the sector (10) to be recorded, the reproduction is attempted again. Sector (1
If it is determined that there is no user data (13) in 0),
Since the abnormal termination report (step S3.513) is immediately sent to the host computer, there is a problem that not only does this place a large burden on the host computer, but also the usage efficiency of the optical disk (1) deteriorates.

This invention was made in order to solve the above-mentioned problems, and even if a flag is erroneously detected during an information recording operation, it is not immediately determined as an abnormality, and the process ends apparently normally.
To provide a recording and reproducing method for a write-once optical disc that improves the usage efficiency of the optical disc without placing an extra burden on a host computer.

[Means for Solving the Problems] A recording and reproducing method for a write-once optical disc according to the present invention provides a method for recording and reproducing a write-once optical disc according to the present invention.
a first determination step of determining whether or not user data exists in the first sector if a flag is detected in the sector; and a first determination step of determining whether or not user data exists in the first sector; a recording step of recording the second user data in a sector of the spare area; and a recording step of recording the second user data in a sector of the spare area when there is no user data in the second sector for reading the second user data during information reproduction, whether the second user data exists in the spare area. and a reproduction step of reproducing the second user data from sectors of the reserved area if the second user data exists in the reserved area.

[Operation] In this invention, even if a flag is detected during information recording, if there is no user data in that sector, it is determined that the flag is erroneously detected, and the first user data is recorded in a sector of the spare area and then viewed. Even if a sector with no user data is detected during information reproduction, if there is second user data in the spare area, the user data is reproduced and the process ends normally.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
2 and 2 are flowcharts showing an embodiment of the present invention, and steps S1 to S6 and Sll-S16 are the same as those described above. Further, the sector format of the optical disc and the configuration of the write-once optical disc device to which an embodiment of the present invention is applied are as shown in FIGS. 3 and 4, respectively.

First, when recording the first user data in the sector (10) as shown in FIG. 1, even if the flag (12) is detected in the sector (10) in step S2, double recording (abnormal ), it is determined whether the user data (13) exists in the sector (10) (first determination step S21).

At this time, if the user data (13) does not exist in the sector (10), it is determined that the flag (12) is erroneously detected, and the first user data is recorded in an arbitrary sector of the spare area (recording step 522). ) Thereafter, the process proceeds to step S5, where the information recording operation is apparently completed normally (step SS), thereby lightening the burden on the host computer.

On the other hand, in step S21, user data (13)
If it is determined that there is an abnormality, the process proceeds to step S3 and reports the abnormal termination to the host computer.

Next, the case where the second user data is read from the sector as shown in FIG. 2 will be described.

In this case, even if it is determined in step S12 that the second user data (13) does not exist in the designated sector (10), the spare area is searched without immediately determining that the abnormality is due to an unrecorded sector. (Second determination step 53)
1).

For example, if flag (12) is erroneously detected during information recording, as described above, the second user data is reliably detected in step S31 because the user data is recorded in the sector of the spare area. It turns out. or,
Since the amount of user data recorded in the sectors of the spare area is extremely small, this search does not require any particular time.

If it is determined in step S31 that the second user data is recorded in the sector of the spare area, it is determined that the data was recorded instead due to flag error detection during information recording, and the second user data Play the data〈
playback step 532), and then proceeds to step S15, where the information playback operation appears to end normally (step 5).
16) Lighten the load on the host computer.

On the other hand, if it is determined in step S31 that the second user data does not exist in the spare area either, this means that there is actually an abnormality, and the process proceeds to step S13 to report the abnormal end to the host computer.

[Effect of the Invention] As described above, according to the present invention, when a flag is detected in the first sector for recording the first user data during information recording, the user data is not stored in the first sector. a first determination step of determining whether or not user data exists; a recording step of recording the first user data in a sector of a spare area if no user data exists in the first sector; and during information reproduction.

If there is no user data in the second sector for reading the second user data, a second determination step of determining whether or not the second user data exists in the spare area; If user data exists, a reproduction step of reproducing the second user data from a sector in the spare area; even if a flag is detected during information recording, if there is no user data in that sector, the flag will be erroneously detected. It is determined that the first user data is recorded in the sector of the spare area, and the end appears to be normal. Even if a sector with no user data is detected during information reproduction, the second user data is not recorded in the spare area. If there is, the user data is played back and the process appears to end normally, thereby reducing the burden on the host computer and providing a write-once optical disc recording/playback method that improves the usage efficiency of the optical disc. There is.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing an information recording operation according to an embodiment of the present invention, FIG. 2 is a flowchart showing an information reproducing operation according to an embodiment of the invention, and FIG. 3 shows a sector format of a general optical disc. Explanatory diagram showing, No. 4
The figure is a block diagram showing a general write-once optical disc device.
FIG. 5 is a flowchart showing an information recording operation according to a conventional write-once optical disc recording/reproducing method, and FIG. 6 is a flowchart showing an information reproducing operation according to a conventional write-once optical disc recording/reproducing method. (1)...Optical disc (2)...Data reproducing means (3)...Flag detection means (4)...User data detection means (5)...Data recording means (6)... Internal control means (10)... Sector (12)... Flag (13)... User data S21... First judgment step S22... Recording step S31... Second judgment step S32 . . . Reproduction step In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a write-once optical disc recording and reproducing method for sequentially recording user data in empty sectors of an optical disc, a flag is set in a first sector for recording first user data during information recording. If detected, a first determining step of determining whether or not user data exists in the first sector; and if user data does not exist in the first sector, storing the first user data as a backup; a recording step for recording in a sector of the area; and a second recording step for reading second user data during information reproduction.
If there is no user data in the sector, the second sector determines whether or not the second user data exists in the reserved area.
and a reproduction step of reproducing the second user data from a sector in the spare area if the second user data is present in the spare area. Recording and playback method.